OK...this is weird. I've had zero problems with my M13 and it's been updated to the latest firmware since the firmware release day.

Just last night, when recording loops, the playback will have a volume drop for a couple of seconds at the start of the loop. I've checked the looper playback settings in setup and everything is at 100% as usual.

However - if you put the looper into slow speed mode and record a loop - no problem. Flip to normal speed recording....volume drop at the start of the loop.

I'm using the true bypass setting. There's just the M13 between the guitar and amp. I have not tried reinstalling the software. Actually, I'm kinda nervous about re-flashing. It worked fine the first time but with all of the folks having issues....maybe it's not a great idea?

Anyway, the M13's been flawless up to now...this is the first problem I've had. The slow mode work around seems to solve it....maybe I should just leave it alone until a new firmware version is released?

I only use 1/2 speed mode to loop...you get double the recording time, with pretty much the same quality. I have to admit, as much as I use the looper, this has never happened to me. But I pretty much always have to reset the expression pedal for the looper as soon as I turn the M13 on, though. It always 'defaults' to 0 volume. No matter if I saved it at something else.